Predicted to enable RNA-DNA hybrid ribonuclease activity. Acts upstream of or within mismatch repair. Part of ribonuclease H2 complex. Is expressed in several structures, including embryo ectoderm; gut; hemolymphoid system gland; skin; and testis. Human ortholog(s) of this gene implicated in Aicardi-Goutieres syndrome. Orthologous to human RNASEH2A (ribonuclease H2 subunit A). [provided by Alliance of Genome Resources, Apr 2022]